PHP - Merging two arrays into one array (also Remove Duplicates)

Question

Hi I'm Trying to merge two arrays and also want to remove duplicate values from final Array.

Here is my Array 1:

Array
    (
    [0] => stdClass Object
    (
    [ID] => 749
    [post_author] => 1
    [post_date] => 2012-11-20 06:26:07
    [post_date_gmt] => 2012-11-20 06:26:07
)

And this is my array 2:

Array
(
[0] => stdClass Object
(
[ID] => 749
[post_author] => 1
[post_date] => 2012-11-20 06:26:07
[post_date_gmt] => 2012-11-20 06:26:07

)

I'm using array_merge for merging both arrays into one array. it is giving output like this

Array
(
[0] => stdClass Object
(
[ID] => 749
[post_author] => 1
[post_date] => 2012-11-20 06:26:07
[post_date_gmt] => 2012-11-20 06:26:07

[1] => stdClass Object
(
[ID] => 749
[post_author] => 1
[post_date] => 2012-11-20 06:26:07
[post_date_gmt] => 2012-11-20 06:26:07

)

I want to remove these duplicate entries or can I remove these before merging... Pleas help.. Thanks!!!!!!!

Solution 1

array_unique(array_merge($array1,$array2), SORT_REGULAR);

http://se2.php.net/manual/en/function.array-unique.php

Solution 2

As already mentioned, array_unique() could be used, but only when dealing with simple data. The objects are not so simple to handle.

When php tries to merge the arrays, it tries to compare the values of the array members. If a member is an object, it cannot get its value and uses the spl hash instead. Read more about spl_object_hash here.

Simply told if you have two objects, instances of the very same class and if one of them is not a reference to the other one - you will end up having two objects, no matter the value of their properties.

To be sure that you don't have any duplicates within the merged array, Imho you should handle the case on your own.

Also if you are going to merge multidimensional arrays, consider using array_merge_recursive() over array_merge().

Solution 3

It will merger two array and remove duplicate

<?php
 $first = 'your first array';
 $second = 'your second array';
 $result = array_merge($first,$second);
 print_r($result);
 $result1= array_unique($result);
 print_r($result1);
 ?>

Try this link link1

Solution 4

try to use the array_unique()

this elminates duplicated data inside the list of your arrays..

Solution 5

You can use this code to get the desired result. It will remove duplicates.

$a1=array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
$a2=array("e"=>"red","f"=>"green","g"=>"blue");

$result=array_unique(array_merge($a1,$a2));

print_r($result);

View more solutions

Comments

[Ravikumar Sharma]

@ Hemantxp > with out SORT_REGULAR it is giving this error: Catchable fatal error: Object of class stdClass could not be converted to string

[Mike]

Its worth noting that array_unique returns the filtered array (rather than acting directly on the array parameter passed in) so you need to store the result before you can use it

[David Baucum]

By default array_unique tries to use the array values as strings. Hence the error @Ravi ran into. If your array is only strings then you don't need the third argument. If it is not a string, or the contents cannot be implicitly cast to a string, you will need the SORT_REGULAR argument.

[mapmalith]

@Hemantwagh07 For array objects, if we do not user SORT_REGULAR it gives Recoverable fatal error: Object of class stdClass could not be converted to string in...<path to file>

[Warren Sergent]

Whilst this will find ONLY unique entries (i.e. anything in both arrays will be removed), the OP question wanted to remove duplicates AFTER merge. So using your example, the desired result is red/green/blue/yellow kept from red/green/blue/yellow/red/green/blue after the two arrays are combined.